ProgramNode(0...10)(
  [],
  StatementsNode(0...10)(
    [InterpolatedStringNode(0...10)(
       (0...1),
       [EmbeddedStatementsNode(1...5)(
          (1...3),
          StatementsNode(3...4)(
            [CallNode(3...4)(nil, nil, (3...4), nil, nil, nil, nil, 0, "a")]
          ),
          (4...5)
        ),
        EmbeddedStatementsNode(5...9)(
          (5...7),
          StatementsNode(7...8)(
            [CallNode(7...8)(nil, nil, (7...8), nil, nil, nil, nil, 0, "b")]
          ),
          (8...9)
        )],
       (9...10)
     )]
  )
)
